Tree diversity as a control of whole tree water use in experimentally assembled mixtures in Panama

巴拿马实验组装混合物中树木多样性作为整棵树用水的控制

• 批准号: 30655518
• 负责人: Professor Dr. Dirk Hölscher
• 金额: --
• 依托单位: Abteilung Waldbau und Waldökologie der Tropen
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/30655518?language=en
• 关键词: Tree; diversity; control; whole; tree

As natural tropical forests diminish and former rain forest areas are being degraded, more tropical tree plantations may be established. Up to now, they usually consist of a single exotic fast growing species. There is much, and recently increasing concern about high water use rates and non-sustainable soil nutrient depletion by such plantations. Recent approaches to reforestation in the tropics emphasize the establishment of native species in mixed stands. In an experimental plantation in Panama, native tree species, which in natural forest exhibit different relative growth rates, were planted at different diversity levels. The proposed project intends to analyze the whole tree water use of these species in plots of different diversity levels (1-, 3-, and 6-species mixtures), and to analyze the soil water partitioning among cooccurring species. The methods include soil hydrological measurements, tree sap flux analyses and the application of stable isotope techniques (¿D). We plan to cooperate closely with a project studying the tree nutrient budget. Overall, we wish to increase the knowledge for an ecologically sound reforestation of degraded tropical areas with respect to tree species diversity and water and nutrient resources.

随着天然热带森林的减少，以前的热带雨林区正在退化，可能会建立更多的热带树木种植园。到目前为止，它们通常由单一的外来快速生长物种组成。人们对这类种植园的高水分利用率和不可持续的土壤养分枯竭有很大的担忧，而且最近越来越多。最近在热带重新造林的方法强调在混交林中建立本地树种。在巴拿马的一个试验性人工林中，在自然林中表现出不同相对生长率的本土树种被种植在不同的多样性水平上。该项目旨在分析这些树种在不同多样性水平(1种、3种和6种混合)的样地中的整个树木水分利用情况，并分析共存物种之间的土壤水分分配。这些方法包括土壤水文测量、树液通量分析和稳定同位素技术(D)的应用。我们计划与一个研究树木养分收支的项目密切合作。总体而言，我们希望增加对退化热带地区在树木物种多样性以及水和养分资源方面进行生态无害再造林的知识。